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  • which seat post diameter
  • Kevsterjw
    Free Member

    I have measured my existing seat post as 31.3 with vernier calipers, which should I buy to replace it, 30.9 or 31.6??

    Posted 11 years ago
    wwaswas
    Full Member

    I’d measure the hole it’s going in.

    Posted 11 years ago
    shortcut
    Full Member

    Look it up against the frame spec or read the markings on your existing frame, or measure the size of the orifice!

    Posted 11 years ago
    nickjb
    Free Member

    Far more likely to be undersized than over but best to check. What frame is it?

    Posted 11 years ago
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